staging: unisys: fix CamelCase variables in boottotool functions

Rename the local CamelCase variable

efiSparIndication => efi_spar_indication

Update all references to use the corrected name.

Signed-off-by: Benjamin Romer <benjamin.romer@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>